ClosedSystem - ME 201 Thermodynamics First Law for Closed...

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1 ME 201 Thermodynamics First Law for Closed Systems Guide Recall that for a closed system there are no mass inflows or mass outflows, so the mass of the closed system remains constant throughout the process or m = m 1 2 Also, due to our quasi-static equilibrium assumption, we can not have any shaft work out of a closed system. We can re-write our 1st law equation as W - W - Q = ) e - m(e bnd sh 1 2 For most closed systems we can neglect kinetic energy and potential energy changes. We call these simple closed systems and can write our energy conservation as W - W - Q = ) u - m(u bnd sh 1 2 Some examples of simple closed systems include Piston-Cylinder System Rigid Tank or Container Balloon In solving simple closed system problems, we need to identify the unknowns, so we will know how to proceed. The possible unknowns are Heat Transfer Shaft Work Boundary Work Initial State (State 1) Final State (State 2) We first observe that heat transfer and shaft work can only be calculated from the first law. This means only one of them can be unknown. If shaft work is not explicitly
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This note was uploaded on 07/25/2008 for the course ME 201 taught by Professor Somerton during the Spring '06 term at Michigan State University.

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ClosedSystem - ME 201 Thermodynamics First Law for Closed...

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